19-0367; Rev 1; 5/06
20µA,
1
⁄
8
-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_______________General Description
The MAX1482 and MAX1483 are low-power trans-
ceivers for RS-485 and RS-422 communication. Both
feature slew-rate-limited drivers that minimize EMI and
reduce reflections caused by improperly terminated
cables. Data rates are guaranteed up to 250kbps.
The MAX1482/MAX1483 draw only 20µA of supply cur-
rent. Additionally, they have a low-current shutdown
mode that consumes only 0.1µA. Both parts operate
from a single +5V supply.
Drivers are short-circuit current limited and are protect-
ed against excessive power dissipation by thermal
shutdown circuitry that places the driver outputs into a
high-impedance state. The receiver input has a fail-safe
feature that guarantees a logic-high output if the input
is open circuit.
The MAX1482 is full duplex and the MAX1483 is half
duplex. Both parts have a
1
⁄
8
-unit-load input impedance
that guarantees up to 256 transceivers on the bus.
____________________________Features
♦
Low 20µA Operating Current
♦
Slew-Rate Limited for Reduced EMI and
Reduced Reflections
♦
0.1µA Low-Current Shutdown Mode
♦
Designed for RS-485 and RS-422 Applications
♦
Operate from a Single +5V Supply
♦
-7V to +12V Common-Mode Input Voltage Range
♦
Allows up to 256 Transceivers on the Bus—
Guaranteed (
1
⁄
8
-unit load)
♦
Current Limiting and Thermal Shutdown for
Driver Overload Protection
MAX1482/MAX1483
Ordering Information
PART
MAX1482CPD
MAX1482CSD
MAX1482EPD
MAX1482ESD
MAX1483CPA
MAX1483CSA
MAX1483CUA
MAX1483EPA
MAX1483ESA
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 PDIP
14 SO
14 PDIP
14 SO
8 PDIP
8 SO
8 µMAX
®
8 PDIP
8 SO
PKG
CODE
P14-3
S14-4
P14-3
S14-4
P8-1
S8-5
U8-1
P8-1
S8-5
________________________Applications
Low-Power RS-485/RS-422 Networks
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Large 256-Node LANs
_________Typical Operating Circuits
_________________Pin Configurations
TOP VIEW
RO
1
R
8
7
6
D
5
V
CC
B
A
GND
+5V
RE
2
DE
MAX1483
RO
1
R
RE
2
DE
3
DI
4
D
8
7
B
Rt
6
A
5
GND
A
R
RE
V
CC
B
Rt
D
DE
3
DI
DI
4
DIP/SO
RO
B
V
CC
RO
1
2
3
8
A
GND
DI
DE
MAX1483
7
6
5
NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM
DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH.
TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE.
RE
4
µMAX
MAX1482 appears at end of data sheet.
µMAX is a registered trademark of Maxim Integrated products, Inc.
MAX1482 appears at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
